how to access only first dictionary in python using for loop code example

Example 1: iterate through dictionary

#iterate the dict by keys
for key in a_dict:
	print(key)
#iterate the dict by items - (key,value)
for item in a_dict.items():
    print(item)
#iterate the dict by values
for value in a_dict.values():
    print(value)

Example 2: python loop through dictionary

d = {'x': 1, 'y': 2, 'z': 3} 
for key in d:
    print key, 'corresponds to', d[key]